Features

Liquid-lubricated double seal for top-entry drives
Cartridge unit
Self-closing on the product side
For stepped and unstepped shafts
Unbalanced
Independent of direction of rotation
Multiple springs rotating

Advantages

Ready-to-fit and factory-tested units
The M481K and its variants will remain closed even during pressure variations or pressure reversal. Operation is possible with buffer fluid (p1max = 6 bar (87 PSI)) or pressurized with barrier fluid as double seal
Available with or without bearing
Suitable for standardizations
Seal can be applied at higher pressure and rotating speed than specified by DIN

Operating range

Shaft diameter:
d1 = 40 ... 220 mm (1.57" .... 8.66")
Pressure:
p1 = vacuum ... 16 bar (232 PSI),
p3 = max. 18 bar (261 PSI)
Temperature:
t1 = -40 °C ... +200 (350*) °C
(-40 °F ... +392 (662*) °F)
Sliding velocity:
vg = 0 ... 5 m/s (0 ... 16 ft/s)

Materials

Seal faces: Carbon graphite or Silicon carbide, FDA conform
Seats: Silicon carbide, FDA conform
Secondary seals and metallic parts acc. to application and customers' requirement

Standards and approvals

FDA
ATEX
DIN 28138 (mechanical seals for agitator shafts)
DIN 28136 T2 (for steel vessels)
DIN 28141 (flange connection for steel vessels)
DIN 28154 (shaft end for steel vessels)
Compliant to TA Luft (German Clean Air Act)

Recommended applications

Refining technology
Petrochemical industry
Chemical industry
Pharmaceutical industry
Food and beverage industry
Agitators
Reactors